You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation, due to some problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: Yes, I will definetly help you in that one.

USER: Thanks.

ASSISTANT: Please wait for a moment to check your booking in our data base and I will get back to you.

USER: Sure.

ASSISTANT: May I know you name for checking purpose?

USER: Sure, my name is Robert Taylor.

ASSISTANT: I am sorry Taylor, there is no reservation found on the name which you have provided.

USER: Oh! May be my ticket not booked properly at that time. Thank you for your information.

ASSISTANT: Yes, I think it might be happened, you are welcome.