You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I aid you today?

USER: Can you help me in changing my existing reservation has my exams got postponed?

ASSISTANT: On which name your previous ticket has been reserved?

USER: I am Jason Robinson.

ASSISTANT: Just hold on, let me check your reservation and get back to you.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found with your given name in our records.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for communicating with us.