You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jennifer Adams.

ASSISTANT: What can I do for you today?

USER: I would like to change my existing reservation, due to sudden changes in climate my planning to visit for a trip has been postponed. Can you please help me in changing?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records in our data base.

USER: Ok, no issues at all. Thank you.

ASSISTANT: Thank you reaching us.