You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Jackson.

ASSISTANT: How may I guide you today?

USER: Can you please help me in booking my flight ticket from IAD to JFK?

ASSISTANT: Can you please share your preferable journey dates?

USER: My travelling dates are 01/09 and 01/11.

ASSISTANT: Please wait for a minute.

USER: Ok, sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.