You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am Jennifer Garcia. I want to change my existing reservation, due to my meeting got postponed with my client. Can you please help me with that?

ASSISTANT: Sure, wait for some time I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thanks for choosing us.