You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Yes, can you tell me your name?

USER: Check under the name Rachel Thomas.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: No issue, thank you.

ASSISTANT: Thank you for contacting us.