You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Can you let me know your name to check for your reservation availability?

USER: I am Rachel Smith.

ASSISTANT: Can you wait a moment I will check our records of reservation?

USER: Sure.

ASSISTANT: Sorry, there are no reservations been found on your name to change.

USER: That's ok. Thank you.

ASSISTANT: Thank you for connecting with our agency.