You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Jerry Evans here. Due to heavy rains in my locality, I would like to change my existing reservation. Will you help me with this?

ASSISTANT: Ok, please let me check with your reservation.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, no reservation found by your name.

USER: Ok, no issues.

ASSISTANT: Thanks for reaching.

USER: Thank you for your help.

ASSISTANT: Have a nice day.