You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: My final examinations got postponed, so I just want to change my travel dates in the past reservation. Could you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: Thank you. My name is Jeffrey Lee.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, take your time. I can wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name to change.

USER: It's ok, not a problem with that one. Thanks a lot for your time in checking my ticket status.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.