You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I am Michelle Allen. I am planning to travel from SFO to JFK, can you help in booking a flight?

ASSISTANT: Sure, I am here to help you. Will you please provide me your travel dates to search the flight?

USER: My travelling dates are 09/15 to 09/17.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, I have not found any flight with the dates you have provided.

USER: That's ok, thank you.

ASSISTANT: You are welcome, thank you for choosing our travel agency.