You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to travel in normal cost airline to meet my childhood friend, can you help me with booking a connecting flight?

ASSISTANT: Sure, can you please share your preferable journey journey dates?

USER: My journey dates are Aug 17 and Aug 19.

ASSISTANT: Can you please mention your source and destination airport codes?

USER: My airport codes are SFO to IAD.

ASSISTANT: May I know your name please?

USER: I am Patrick Wilson.

ASSISTANT: Do you have any specifications?

USER: My depart time is evening and return time is afternoon.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.