You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emma Gonzalez here.

ASSISTANT: Emma Gonzalez. How can I help you?

USER: Could you book my ticket in a connecting flight?

ASSISTANT: Sure, I am here to help you. May I know your journey dates.

USER: My itinerary dates are June 21 and June 23.

ASSISTANT: May I know the genesis and terminus airport codes.

USER: My genesis and terminus airport codes are SFO and DFW.

ASSISTANT: Do you have any airline preferences?

USER: No, I want to depart in the evening and return in the morning.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I regret to inform that, there are no flights on your desired dates.

USER: No problem, I will find an alternative way to travel.

ASSISTANT: Ok.

USER: Thank you for assisting me.

ASSISTANT: Thank you for approaching us.