You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Michelle Anderson.

ASSISTANT: How may I assist you?

USER: Please help me in booking from IAD to SFO.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please share your planned journey dates?

USER: My planned dates are from Dec 1 to Dec 3.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the afternoon time with a connecting flight.

ASSISTANT: Thank you for sharing the details.

USER: Ok.

ASSISTANT: There were no flights available that matches your requirements.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for approaching us.