You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello How can I assist you today?

USER: I'm Deborah Smith.

ASSISTANT: Nice to meet you Deborah Smith.

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, please wait a moment.

USER: OK.

ASSISTANT: Sorry Deborah Smith, there is no reservation available as per you provided details.

USER: Thank you for your immediate response.

ASSISTANT: Your welcome.