You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Evans.

ASSISTANT: How can I aid you at this moment?

USER: Owing to emergency I want to change my existing reservation, can you help me with that?

ASSISTANT: Sure, I will help you in changing your reservation. Please give me a moment to check your reservation status.

USER: Sure take your time.

ASSISTANT: Jonathan Evans, I couldn't find any active reservation under your name in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for utilising our service.