You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Margaret Clark.

ASSISTANT: OK Margaret Clark,how can I help you?

USER: I want to book a flight ticket,can you help me?

ASSISTANT: OK can I know your journey details?

USER: Sure, I want to travel from WA-SEA to MI-DTW.

ASSISTANT: I will check whether the flight is available or not. But still may I know your preferable dates for better searching?

USER: My travelling dates are 07/07 to 07/09.

ASSISTANT: Sorry Margaret Clark there are no flights which can matches your requirements.

USER: It's OK, thank you for your help.

ASSISTANT: It's my pleasure. Bye,have a great day ahead.