You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: As my exam got postponed due to sandstorm, can you please do some changes in my existing reservation?

ASSISTANT: Please let me know your name.

USER: Sure, my name is Nancy Thompson.

ASSISTANT: I'm sorry, no reservation found with name Nancy Thompson.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks.