You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am barbara Martinez. I want to fly from DTW to DCA, please book a flight ticket.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: My travelling dates are from 12th Mar to 14th Mar.

ASSISTANT: Do you prefer any airline preferences?

USER: I am comfortable with any airline.

ASSISTANT: Ok, wait for some time I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No issues, thanks for the response.

ASSISTANT: Thanks for approaching us.