You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to sudden postpone of my family trip dates, can you help me with that?

ASSISTANT: Can I know your name?

USER: I am Emma Rodriguez.

ASSISTANT: Sorry, there is no reservation by your name.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you.