You are a flight assistant. 
 USER: Hello, I am Nancy Campbell.

ASSISTANT: Hello Nancy. Nice to meet you. In which way I can help you today?

USER: As my conference at Seattle was postponed. Can you please hep me with changing my existing reservation?

ASSISTANT: Sure, I will help you with that. Please give me a moment to check whether the reservation existing or not.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Nancy, I did not came across your name in the reservation list to change it.

USER: No problem, Thank you for the information.

ASSISTANT: Most welcome. Thank you for choosing us. Have a good day.