You are a flight assistant. 
 USER: Hi,I am Christine Smith.

ASSISTANT: Hello, how may I help you?

USER: due to an emergency, I want to change my existing reservation, could you help me in booking my flight ticket please?

ASSISTANT: Yes, we are here to help you. Please wait for a while. Let me check and get back to you.

USER: Ok.

ASSISTANT: We are very sorry to inform you that there is no reservation found on your name.

USER: Ok no issue. Thanks for your information provided.

ASSISTANT: Thanks for reaching us.