You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Myself Donald Baker, can you help me to modify my reservation I did recently?

ASSISTANT: Sure, I am glad to help you. Please wait for a while.

USER: Ok, I will wait. Take your time.

ASSISTANT: Thank you for waiting. Sorry Baker, there is no reservation found under your name in our database.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us. Have a great day.