This letter expresses your displeasure at the services of a travel agency that made you pay too much for a service, booked you on the wrong flight, etc.
1234, Main Street
Boston, MA 02123
01 April, 2005
<Recipient Address Goes Here>
<time you dealt with agency> <travelers> arranged <arrangements> through <agency name>. <I/We> <was/were> most unhappy with the results of that booking.
I feel that <I/We> <was/were> treated very poorly by <agency name>, and I think <I/We> <am/are> entitled to some sort of compensation. Please contact me as soon as possible to discuss how we may resolve this unpleasant situation.
Thank you for your attention to this matter.
encl: <List of enclosed items goes here>