You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jennifer Garcia.

ASSISTANT: Garcia, what can I do for you?

USER: I wanted to change my reservation due to my planned got postponed. Can you help me is there any chance to change my reservation.

ASSISTANT: Sure, please give me a minute to check.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found on your name.

USER: It's ok.

ASSISTANT: Thank you for reaching us, hope you will contact us in future.

USER: Thank you for all of your valuable information.