You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Clark.

ASSISTANT: In which way I can aid you at this moment?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I will aid you with that. Please wait a moment, I will check your previous reservation status.

USER: Ok.

ASSISTANT: There is no previous reservation available under your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.