You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Mark Garcia.

ASSISTANT: How may I help you?

USER: I am looking for a flight from SEA to IAD, can you help me out?

ASSISTANT: Sure, let me know your travel dates please?

USER: My trip dates are from June 16th till  June 18th.

ASSISTANT: Do you have any specific arrival and depart timings?

USER: I need to my depart my flight in afternoon and return flight in evening.

ASSISTANT: Ok, is there any class preference?

USER: I am ok with any class.

ASSISTANT: May I know your connection limit?

USER: I want connecting flight.

ASSISTANT: Do you have any airline preference?

USER: No, I don't have any specifications.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thanks for reaching us, have a nice day.