You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Sandra Green here.

ASSISTANT: Nice to meet you Sandra.

USER: I would like to book my ticket from DFW to IAD. Can you help me out?

ASSISTANT: Yes, tell me your travel dates please?

USER: My travel dates are from July 19 to July 21.

ASSISTANT: May I know your departure and return time please?

USER: I would like to return in the afternoon time.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight in my journey.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: Sorry there no flights available in the afternoon time.

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

ASSISTANT: Thank you.