You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Richard Perez.

ASSISTANT: How may I lend a hand to?

USER: I am planning to visit  Seattle, will you help me in booking the flight ticket from DTW to SEA?

ASSISTANT: Richard Perez, I am here to help you for this. Can you please provide your travel dates?

USER: My preferable journey dates are Aug 20 and Aug 22.

ASSISTANT: Do you prefer any airline?

USER: No, I am comfortable in any airlines.

ASSISTANT: At what time are you planning to depart and return?

USER: My depart time must be in evening time.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I need a flight with single connection.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you very much for contacting our agency.