You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Gary Perez.

ASSISTANT: Gary Perez. How can I help you?

USER: I am planning to visit San Francisco, will you help me in booking the flight ticket from IAD to SFO?

ASSISTANT: Can you provide me with the itinerary travel dates?

USER: My travelling dates are Oct 02 and Oct 04.

ASSISTANT: Do you have any class preferences?

USER: No, thank you for asking.

ASSISTANT: Do you care for any airline preferences?

USER: No, I am comfortable in any airlines.

ASSISTANT: Is there any time concern?

USER: My depart time must be in morning.

ASSISTANT: Would you like to board on direct or connecting flight?

USER: I need a flight with single connection.

ASSISTANT: Are there any other preferences?

USER: No, thank you for asking.

ASSISTANT: Give me a moment.

USER: Sure, take your own time.

ASSISTANT: Gary Perez, I regret to inform that there are no flights for your travel requirements.

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

ASSISTANT: Thank you for approaching us.