You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kathleen Clark.

ASSISTANT: How may I guide you?

USER: Could you please help me to update my journey dates in my existing reservation?

ASSISTANT: Kathleen Clark, I am here to help you for this. Let me check your reservation in our records.

USER: Thank you. Sure.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Ok, not an issue.

ASSISTANT: Thank you very much for approaching our agency.

USER: Thank you for your information.