You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I am Rachel Clark want to change my reservation owing an emergency. Can you help me in changing?

ASSISTANT: Sure, please wait a minute.

USER: OK.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER:  Thank you for availing us.