You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jennifer Walker.

ASSISTANT: How can I assist you?

USER:  I would like to spend some more days with my family, so please help me in changing my existing reservation?

ASSISTANT: That's good to hear. Please give me a minute, I will be back to you with the reservation status.

USER: Sure, take your own time.

ASSISTANT: Jennifer, there is no reservation available on your name.

USER: That's not a problem.

ASSISTANT: Ok.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us. Have a great day.