You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to change the travel dates in the past ticket?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Thank you for accepting my request. My name is Jonathan Mitchell.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Ok, take your time.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name to change.

USER: It's ok, not a problem with that. Thank you for checking my ticket status.

ASSISTANT: Thank you very much for contacting our agency.