You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Myself Jessica Clark, I am planning to change my reservation. Can you please help me for this?

ASSISTANT: Sure, please wait.

USER: Sure, I will wait for your kind response.

ASSISTANT: I am sorry, there are no reservations with your name in our database.

USER: Not a big deal, anyway thank you very much for your service.

ASSISTANT: Thank you, have a good day.