You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Jerry Clark here. I need to book my ticket from BOS to IAD. Can you please help me with booking?

ASSISTANT: Sure, can you please provide me with your dates of journey?

USER: My journey dates are Jan 21 and Jan 23.

ASSISTANT: May I know your airline preference please?

USER: I am comfortable with any airlines.

ASSISTANT: Do you have any other specifications please? The flight with the number 1011 of Spirit airline of fare 100 has found, shall I book this ticket?

USER: I need to book my ticket in economy class with single connecting and my departure time is evening and return time is Morning, please recheck with that.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no flight found as per your travelling details. Sorry, for the inconvenience.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: You are welcome.