You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ashley Martinez.

ASSISTANT: How can I aid you?

USER: I have to attend a Live Concert at San Francisco, could you please help me with booking a flight ticket from DFW to SFO?

ASSISTANT: Sure, I will help you, may I know your travelling dates?

USER: I would like to depart on Nov 18th and return on Nov 20th.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: Make sure that my depart time must be afternoon.

ASSISTANT: Is there any other preferences?

USER: I am looking for a normal-cost airline.

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

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you.