You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: My exams got postponed due to rain there so I want to change my existing reservation.

ASSISTANT: Sure, may I know your name to check the reservation details?

USER: Myself Sandra Phillips.

ASSISTANT: Sorry, there is no reservation.Do you want any more information please?

USER: No, I don't have any other requirements. Thank you for the information.

ASSISTANT: Ok fine, thank you very much for contacting us.