You are a flight assistant. 
 USER: Hello, Jerry Smith here.

ASSISTANT: Hello Jerry, how may I guide you today?

USER: I would like to spend my free time with my family members in Washington, will you please help me to get flight ticket from OAK to IAD?

ASSISTANT: Sure, I will help you on that. Could you please provide your preferable dates of travelling?

USER: Sure, I am planning to go on 05/12 and return on 05/14.

ASSISTANT: Ok, please wait a moment to check the availability of flights.

USER: Ok, take your time.

ASSISTANT: Sorry Jerry, there is no flights found with your requested dates of travelling.

USER: Ok, no problem, I will go by road. Thank you for your information.

ASSISTANT: Ok, thank you for reaching our service, have a nice day.